Lotjb-speaking wireless phonograph



E. C. HANSON.

LOUD SPEAKING WIRELESS -PHONOGRAPH. APPLICATION men JUNE 4. 191a.

Patented Oct. 28, 1919. L

an era FATNT EARL C. HANSON, 0F LOS ANGELES, CALIFORNIA. ASSIGNOR T0 TITLE INSURANCE AND TRUST COMPANY A CORPORATION" OF CALIFORNIA.

LOUD-SPEAKING WIRELESS PHONOG'R APH.

ean er.

Specification, Letters Patent.

Patented Get. as. rare.

Application filed June 4., 1918. Serial No. 238,109.

To all whom it may concern:

Be it known that I, EARL C. HANsoN, a citizen of the United States, residing at Los Angeles, in the county of Los Angeles and State of California, have invented a new and useful Loud-Speaking Wireless Phonograph, of which the following is a specification.

My invention relates to the art of transmitting music and the like through space without the use of wires.

The principal object of my invention isto provide a receivmg means which utilizes the contact resistance of the human body to control the volume of sound.

Referring to the drawing, which is for illustrative purposes only, a phonograph l is shown having a rotating table 2 on which a record 3 is placed, this record being r0- tated'by a suitable motor 4:. A reproducer 5 having a needle 6 is attached to a tone arm 7 the above parts being standard in the phonograph art. The tone arm 7 connects through a sound passage 8 with a sensi: tive telephone transmitter 9, this transmitter 9 being connected at one terminal to a battery l0 and at the other terminal to the primary 11 of an iron core transformer 12 having a high voltage secondary 13 connected at one terminal to the ground 14 and at the other terminal to an antenna 15.

The receiving apparatus consists of an iron core receiving transformer 20 having a primary 21 and a secondary 22. The secondary 22 is connected at one terminal to a filament 23of a vacuum bulb repeat-er 24 and at the other terminal to the grid 25 in the repeater 24. The filament 23 is excited by a filament battery 26. The filament is also connected through a battery 27 with a telephone receiver 28, the other terminal of the receiver 28 being connected through a wire 29 with the plate 30 in the repeater 24. The receiver 28 is provided with a megaphone 40. The primary 21 is connected to the ground as shown at 31, the other terminal of the primary 21 being preferably connected through a flexible wire .32 with a grip 33 which is of such size and shape that it can be readily grasped by the hand 100.

The utility and method of operation of the invention can be well illustrated if we consider the apparatus installed in a hotel in which case the phonograph 1 would be 7 installed in any convenient location being connected through suitable fine wiring with the antenna 15 which would preferably radiate through the building along the cornices in the hall so that the antenna 15 would have a large area extending through a greater portion of the building.

Any room in which it is desired to hear music would be provided with the receiving apparatus. This receiving apparatus would emit very faint sound even when the grip 33 was not grasped by the hand of an auditor. This would be due to the fact that the music from the record 3 passing through the tone arm 7 and the passage 8 into the transmitter 9- would control the current of the battery 10 by vibrating the diaphragm of the transmitter so that a variable current would flow in the primary 11 of the transformer 12. This Variable current would induce a high potential inthe secondary 13 and this poten tial would be impressed between the ground 14- and the antenna 15 producing variable electro-static charges thereon which in turn would produce electro-static field of audio frequency which would permeate the entire structure inside the hotel. passing as is well understood through most substances. This electro-static field would in turn induce electro-static charges between the grip 33 and the ground 31 and these electro static charges would produce currents in the primary 21 which in turn would produce a potential in the secondary 22. This potential through the vacuum bulb repeater 24 would be utilized to control the battery current flowing from the battery 27 through the receiver 28. The current flowing throl-lgh the receiver 28 would be identical in its wave form with the current in the transmitter 9 and the sounds emitted by the receiver 28 would be identical with the music produced by the phonograph 1. The iron core of the transformer 20 would effectually iron out any currents due to radio-frequency waves which might be received from any source.

By a suitable regulation of the parts the musical sounds emitted by the receiver 28 would be practically inaudible a short distance away from the receiver. desired to greatly increase the volume of sound it would simply be necessary to increase the amount of electro-static capacity connected to the wire 32. A very convenient method of increasing this capacity and reg- If it were ulating the sound is provided by making the grip 33 of such a shape and locating it 111 such a position that it can be readily grasped by the hand 100 of an auditor. Such an auditor, when standing upon a cement or woodenfloor or upon a carpet is sufficiently Well insulated from the ground to furnish the necessary electro-static capacity needed. This addition to the electrostatic capacity increases the volume of current through the receiver 28 and consequently increases the volume of sound em1tted therefrom.

discovery in such a manner that the volume of the sound can be regulated by varying the character of the grasp on the grip 33. If it is desired to have a small volume of music the grip 33 is grasped very lightly,

and the volume of the music is greatly increased by grasping the grip 33 more tightly.

It is thus possible for a person in any room of the hotel in which a receiving apparatus like that illustrated is placed to not only have music at will but to control this music without effort by varying the method of holding the grip 33. It is thus possible for anyone to not only enjoy the music but to vary the character of the music at will.

I claim as my invention:

A. receiving apparatus for audio frequency electric currents comprising a telephone receiver; an iron core transformer; a vacuum bulb repeater; means by which said vacuum bulb repeater is utilized to amplify the current in the secondary of said transformer; and a grip connected to one terminal of the primary of said transformer, the other terminal being connected to ground, said grip being of suitable size and shape to be grasped by an auditor. In testimony whereof, I have hereunto set my hand at Washington, D. C., this 4th day of June, 1918.

EARL C. HANSON. 

